Fashion Flashback: Elisabeth Moss

(Source: Michael Buckner/Getty Images Entertainment, Bauer Griffin, Axelle/Bauer-Griffin)In honor of this Sunday's premiere of Mad Men's final season (gulp), today we're taking a look back at star Elisabeth Moss' evolution on the red carpet. From fresh-faced naif to savvy sophisticate, the actress' style has transformed in sync with that of Peggy Olson, her small-screen alter ego. Along the way, she's road-tested more hair cuts and colors than we can keep up with, and lately has settled on the edgier vibe of jet-black locks (and loads of eyeliner). At the Hollywood premiere of Mad Men's last go-round, she even rocked a slit-to-there leather skirt—the kind of sexpot power look Betty and Joan could only dream of.